Disposable absorbent article with sealed absorbent core with substantially continuously distributed absorbent particulate polymer material

Patent metadata

Field	Value
Publication number	US-9060904-B2
Application number	US-14112408-A
Country	US
Kind code	B2
Filing date	Jun 18, 2008
Priority date	Jun 18, 2007
Publication date	Jun 23, 2015
Grant date	Jun 23, 2015

Abstract

A disposable absorbent article includes a chassis and an absorbent core which is substantially cellulose free. The chassis may contain a topsheet and a backsheet. The absorbent core may be located between the topsheet and the backsheet and may include (i) a storage layer which comprises an absorbent particulate polymer material and has a wearer facing side and an opposed garment facing side, (ii) a first core wrap sheet covering the wearer facing side of the storage layer, and (iii) a second core wrap sheet covering the garment facing side of the storage layer, the first core wrap sheet being joined to the second core wrap sheet along at least one traverse sealing zone.

First claim

What is claimed is:

1. A disposable absorbent article comprising:
a chassis including a topsheet and a backsheet; and
an absorbent core, which is substantially cellulose free, located between the topsheet and the backsheet and having a wearer facing side oriented toward a wearer when the article is being worn and an opposed garment facing side, the absorbent core comprising
(i) a storage layer which comprises an absorbent particulate polymer material and has a wearer facing side and an opposed garment facing side,
(ii) a first core wrap sheet covering the wearer facing side of the storage layer, the first core wrap sheet being a first substrate for a first absorbent layer, and
(iii) a second core wrap sheet covering the garment facing side of the storage layer, the second core wrap sheet being a second substrate for a second absorbent layer,
wherein:
the first core wrap sheet is joined to the second core wrap sheet along at least one traverse sealing zone, the traverse sealing zone covering a total area,
the storage layer, the first core wrap sheet, and the second core wrap sheet together comprise the first and second absorbent layers, and
the absorbent particulate polymer material is deposited on the first and second substrates and thermoplastic adhesive material covers the absorbent particulate polymer material on the respective first and second substrates, the first and second absorbent layers combined together such that at least a portion of the thermoplastic adhesive material of the first absorbent layer contacts at least a portion of the thermoplastic adhesive material of the second absorbent layer, the absorbent particulate polymer material is disposed between the first and second substrates in an absorbent particulate polymer material area, and the absorbent particulate polymer material is substantially continuously distributed across the absorbent particulate polymer material area;
wherein the absorbent particulate polymer material is deposited on the first and second substrates in respective patterns of land areas and junction areas between the land areas such that the absorbent particulate polymer material is discontinuously distributed on the first and second substrates; and the first and second absorbent layers are combined together such that the respective patterns of absorbent particulate polymer material are offset from one another;
wherein the width of the land areas is from about 8 mm to about 12 mm and the width of the junction areas is less than about 5 mm;
wherein the absorbent core has a front end and a rear end and a longitudinal axis extending from the rear end to the front end and a plurality of four absorbent zones disposed along said longitudinal axis of said absorbent core, each of the plurality of four absorbent zones having absorbent particulate polymer material present in differing amounts between the plurality of four absorbent zones and each absorbent zone is substantially cellulose free and a gradual transition in amount of absorbent particulate polymer material from one of the plurality of four absorbent zones to another.

2. The disposable absorbent article of claim 1 , wherein the traverse sealing zone provides a bond strength of at least about 1 N/cm between the first core wrap sheet and the second core wrap sheet as measured as tensile strength in the longitudinal direction, and wherein the traverse sealing zone comprises an open area of at least about 20% of the total area.

3. The disposable absorbent article of claim 2 , wherein the traverse sealing zone comprises an open area from about 30% to about 95% of the total area.

4. The disposable absorbent article of claim 1 , wherein the traverse sealing zone comprises a plurality of threads of adhesive that are separated by a plurality of areas having no adhesive.

5. The disposable absorbent article of claim 4 , wherein the areas in the traverse sealing zone having no adhesive have a width of at least about 0.5 times the mean diameter of the absorbent particulate polymer material.

6. The disposable absorbent article of claim 4 , wherein the threads have a diameter from about 100 microns to about 2 millimeters.

7. The disposable absorbent article of claim 1 , wherein the traverse sealing zone comprises an absorbent particulate polymer material movement obstruction agent applied between and about the traverse edges of the first and second core wrap sheets.

8. The disposable absorbent article of claim 1 , wherein the first core wrap sheet is further joined to the second core wrap sheet along at least one longitudinal sealing zone.

9. The disposable absorbent article of claim 1 , wherein the longitudinal sealing zone comprises at least one thread of adhesive running substantially the length of the absorbent core.

10. The disposable absorbent article of claim 1 , wherein the respective patterns are substantially the same.

11. The disposable absorbent article of claim 1 , wherein the absorbent particulate polymer material area extends substantially entirely across the absorbent core.

12. The disposable absorbent article of claim 1 , wherein the absorbent core consists essentially of the first and second. substrates, the absorbent particulate polymer material, and the thermoplastic adhesive material.

13. The disposable absorbent article of claim 1 , wherein the absorbent core has a front end and a rear end and a longitudinal axis extending from the rear end to the front end and the land areas of the respective patterns are arranged in a grid which is positioned at an angle from about 5 to about 85 degrees from the longitudinal axis of the absorbent core.

14. The disposable absorbent article of claim 1 , wherein the absorbent core has a length extending from a rear end to a front end, and a width extending from a first edge to a second edge and perpendicularly to the length, and the respective patterns are offset from one another in both a direction parallel to the length and a direction parallel to the width.

15. The disposable absorbent article of claim 1 , further comprising an acquisition system, which is located between the absorbent core and the topsheet.

16. The disposable absorbent article of claim 1 , wherein the absorbent article is a diaper comprising a re-closable fastening system joined to the chassis for securing the diaper to a wearer.

17. The disposable absorbent article of claim 1 , wherein the absorbent article is a pant-type diaper comprising at least two side panels joined to the chassis and to each other to form a pant.

Assignees

• Hundorf Harald Hermann
• Beruda Holger
• Blessing Horst
• Dziezok Peter
• Krause Axel
• Schmidt Mattias
• Stelzig Lutz
• Procter & Gamble

Inventors

• Hundorf Harald Hermann
• Beruda Holger
• Blessing Horst
• Dziezok Peter
• Krause Axel
• Schmidt Mattias
• Stelzig Lutz

Classifications

• A61F13/5323 Primary

  having absorbent material located in discrete regions, e.g. pockets · CPC title

• A61F13/536 Primary

  having discontinuous areas of compression · CPC title

• A61F2013/15016

  for breast; pads for bras · CPC title

• A61F2013/530547

  positioned in a separate layer or layers · CPC title

• A61F13/537

  characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer {(A61F13/538 takes precedence)} · CPC title